Zenaida Gonzalez, currently embroiled in a legal battle with Casey, is suing her for defamation after Casey told cops that a woman with a similar name to Gonzalez's had kidnapped Caylee.

"Casey is going to be grilled by Zenaida's lawyers about her journals because they believe that Zenaida is mentioned in them and that is relevant information that the jury needs to hear," a source close to the situation tells RadarOnline.com.

"Zenaida's lawyers could ask that Casey's journals be admitted into evidence so the jury could read and review during jury deliberations. It's expected that Casey's attorneys are going to vehemently oppose that line of questioning and any action to get Casey's journals in front of the jury."